Published in Bollettino Malacologico, in 1991, in volume 26, issue 10-12, pages 157-164

Published in Bollettino Malacologico, in 1991, in volume 26, issue 10-12, pages 165-168

Published in Bollettino Malacologico, in 1991, in volume 26, issue 10-12, pages 169-172

Published in Bollettino Malacologico, in 1991, in volume 26, issue 10-12, pages 173-178

Published in Bollettino Malacologico, in 1991, in volume 26, issue 10-12, pages 179-188

Published in Bollettino Malacologico, in 1991, in volume 26, issue 10-12, pages 189-195

Published in Bollettino Malacologico, in 1991, in volume 26, issue 10-12, pages 196-200

Published in Bollettino Malacologico, in 1991, in volume 26, issue 10-12, pages 201-204

Published in Bollettino Malacologico, in 1991, in volume 26, issue 10-12, pages 205-210

Published in Bollettino Malacologico, in 1991, in volume 26, issue 10-12, pages 211-218

Published in Bollettino Malacologico, in 1991, in volume 26, issue 10-12, pages 219-220

Published in Bollettino Malacologico, in 1991, in volume 27, pages 49-55

Published in Bollettino Malacologico, in 1991, in volume 27, issue 1-4, pages 1-8

Published in Bollettino Malacologico, in 1991, in volume 27, issue 1-4, pages 25-34

Published in Bollettino Malacologico, in 1991, in volume 27, issue 5-9, pages 101-106

Published in Bollettino Malacologico, in 1991, in volume 27, issue 5-9, pages 107-120

Published in Bollettino Malacologico, in 1991, in volume 27, issue 10-12, pages 149-247